bug#43113: tab incorrectly moves to first button, not next button

[Robert Weiner]

Thanks for tracking this down.  We’ll work on fixing it in about a week.

-- Bob

> On Aug 30, 2020, at 11:58 AM, Craig Andera <candera@wangdera.com> wrote:
> 
> 
> I use:  Editor:      GNU Emacs 26.3 (build 1, x86_64-apple-darwin18.2.0, NS 
> appkit-1671.20 Version 10.14.3 (Build 18D109))
> 
>         Hyperbole:   7.1.2
>         Sys Type:    x86_64-apple-darwin18.2.0
>         OS Type:     darwin
>         Window Sys:  ns
> 
> In the Hyperbole DEMO file, hitting tab always takes me to the first button, 
> rather than the next one. I traced into the elisp a bit, and sure enough 
> `next-button` does not find the buttons in the file other than the one at the 
> top. Which seems to be due to `next-single-char-property-change` not finding 
> a `button` property change until the end of the file.
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